package com.sun.interceptor;

import com.sun.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Author: 黄日盛
 * @ClassName: LoginInterceptor
 * @Description: 登录拦截器
 * @Date: 2025-03-21 15:41
 * @Version: 1.0
 */
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        User user = (User)request.getSession().getAttribute("user");
        if(user == null){ // 判断是否登录，没有则返回登录界面
            request.setAttribute("msg","登录后才可以访问");
            request.getRequestDispatcher("/index").forward(request,response);
        return false;
        }else {
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}